Bile acid derivatives as FXR ligands for the prevention or treatment of FXR-mediated diseases or conditions

ABSTRACT

The present invention relates to compounds of formula (I): 
     
       
         
         
             
             
         
       
         
         
           
             wherein R is hydrogen or alpha-hydroxy, 
             the hydroxyl group in position 7 is in the alpha or beta position; 
             and pharmaceutically acceptable salts, solvates or amino acid conjugates thereof.

RELATED APPLICATIONS

This application is a continuation and claims the benefit of priorityunder 35 U.S.C. §120 of U.S. patent application Ser. No. 13/082,261,filed Apr. 7, 2011, which is a continuation and claims the benefit ofpriority under 35 U.S.C. §120 of U.S. patent application Ser. No.11/819,517, filed Jun. 27, 2007 (now U.S. Pat. No. 7,932,244), which isrelated to and claims priority from U.S. Provisional Patent ApplicationNo. 60/816,635, filed Jun. 27, 2006. The contents of each of theseapplications are incorporated herein by reference in their entireties.

FIELD OF THE INVENTION

The present invention relates to Farnesoid X receptor (FXR) modulatorswhich can be used for the treatment of cholestatic disorders, inparticular to bile acid derivatives wherein the C₆ contains an ethyl andthe C₂₄ carboxy group is transformed into a sulphate group.

BACKGROUND OF THE INVENTION

Farnesoid X Receptor (FXR) is an orphan nuclear receptor initiallyidentified from a rat liver cDNA library (B M. Forman, et al., Cell81:687-693 (1995)) that is most closely related to the insect ecdysonereceptor. FXR is a member of the nuclear receptor family ofligand-activated transcription factors that includes receptors for thesteroid, retinoid, and thyroid hormones (D J. Mangelsdorf, et al., Cell83:841-850 (1995)). Northern and in situ analysis show that FXR is mostabundantly expressed in the liver, intestine, kidney, and adrenal (B M.Forman, et al., Cell 81:687-693 (1995) and W. Seol, et al., Mol.Endocrinnol. 9:72-85 (1995)). FXR binds to DNA as a heterodimer with the9-cis retinoic acid receptor (RXR). The FXR/RXR heterodimerpreferentially binds to response elements composed of two nuclearreceptor half sites of the consensus AG(G/T)TCA organized as an invertedrepeat and separated by a single nucleotide (IR-1 motif) (B M. Forman,et al., Cell 81:687-693 (1995)). An early report showed that rat FXR isactivated by micromolar concentrations of farnesoids such as farnesoland juvenile hormone (B M. Forman, et al., Cell 81:687-693 (1995)).However, these compounds failed to activate the mouse and human FXR,leaving the nature of the endogenous FXR ligand in doubt. Severalnaturally-occurring bile acids bind to and activate FXR at physiologicalconcentrations (PCT WO 00/37077, published 29 Jun. 2000)). As discussedtherein, the bile acids that serve as FXR ligands includechenodeoxycholic acid (CDCA), deoxycholic acid (DCA), lithocholic acid(LCA), and the taurine and glycine conjugates of these bile acids.

Bile acids are cholesterol metabolites that are formed in the liver andsecreted into the duodenum of the intestine, where they have importantroles in the solubilization and absorption of dietary lipids andvitamins. Most bile acids (˜95%) are subsequently reabsorbed in theileum and returned to the liver via the enterohepatic circulatorysystem. The conversion of cholesterol to bile acids in the liver isunder feedback regulation: bile acids down-regulate the transcription ofcytochrome P450 7a (CYP7a), which encodes the enzyme that catalyzes therate limiting step in bile acid biosynthesis. There is data to suggestthat FXR is involved in the repression of CYP7a expression by bileacids, although the precise mechanism remains unclear (D W. Russell,Cell 97:539-542 (1999)). In the ileum, bile acids induce the expressionof the intestinal bile acid binding protein (IBABP), a cytoplasmicprotein which binds bile acids with high affinity and may be involved intheir cellular uptake and trafficking. Two groups have now demonstratedthat bile acids mediate their effects on IBABP expression throughactivation of FXR, which binds to an IR-1 type response element that isconserved in the human, rat, and mouse IBABP gene promoters. Thus FXR isinvolved in both the stimulation (IBABP) and the repression (CYP7a) oftarget genes involved in bile acid and cholesterol homeostasis.

EP 1392714 discloses 3α,7α-dihydroxy-6α-ethyl-5β-cholan-24-oic acid(hereinafter also referred to as 6-ethyl-chenodeoxycholic acid, 6-EDCA),solvates and amino acids conjugates thereof as FXR agonists, which canbe used in the preparation of medicaments for the prevention ortreatment of FXR-mediated diseases or conditions.

EP 1568796 discloses 6-ethyl-ursodeoxycholic acid (6-EUDCA) derivativesas FXR agonists and their use in the prevention or treatment ofFXR-mediated diseases or conditions.

BRIEF SUMMARY OF THE INVENTION

According to a first aspect, the present invention provides compounds offormula (I):

wherein R is hydrogen or alpha-hydroxy,

the hydroxyl group in position 7 is in the alpha or beta position;

and pharmaceutically acceptable salts, solvates or amino acid conjugatesthereof.

In one embodiment, the compound of formula (I) is in the form of achenodeoxycholic acid derivative. In another embodiment, the compound offormula (I) is in the form of a ursodeoxycholic acid derivative. Instill another embodiment, the compound of formula (I) is in the form ofa cholic acid derivative.

In another embodiment, the compound of formula (I) is in the form of atriethyl ammonium salt:

In another embodiment, the compound of formula (I) is in the form of asodium salt:

In another aspect, the present invention provides a method for theprevention or treatment of an FXR mediated disease or condition. Themethod comprises administering a therapeutically effective amount of acompound of formula (I). The present invention also provides the use ofa compound of formula (I) for the preparation of a medicament for theprevention or treatment of an FXR mediated disease or condition.

In certain embodiments, the FXR-mediated disease or condition iscardiovascular disease, atherosclerosis, arteriosclerosis,hypercholesteremia, or hyperlipidemiachronic liver disease,gastrointestinal disease, renal disease, cardiovascular disease,metabolic disease, cancer (i.e., colorectal cancer), or neurologicalindications such as stroke. In certain embodiments, the chronic liverdisease is primary biliary cirrhosis (PBC), cerebrotendinousxanthomatosis (CTX), primary sclerosing cholangitis (PSC), drug inducedcholestasis, intrahepatic cholestasis of pregnancy, parenteral nutritionassociated cholestasis (PNAC), bacterial overgrowth or sepsis associatedcholestasis, autoimmune hepatitis, chronic viral hepatitis, alcoholicliver disease, nonalcoholic fatty liver disease (NAFLD), nonalcoholicsteatohepatitis (NASH), liver transplant associated graft versus hostdisease, living donor transplant liver regeneration, congenital hepaticfibrosis, choledocholithiasis, granulomatous liver disease, intra- orextrahepatic malignancy, Sjogren's syndrome, Sarcoidosis, Wilson'sdisease, Gaucher's disease, hemochromatosis, or alpha 1-antitrypsindeficiency. In certain embodiments, the gastrointestinal disease isinflammatory bowel disease (IBD) (including Crohn's disease andulcerative colitis), irritable bowel syndrome (IBS), bacterialovergrowth, malabsorption, post-radiation colitis, or microscopiccolitis. In certain embodiments, the renal disease is diabeticnephropathy, focal segmental glomerulosclerosis (FSGS), hypertensivenephrosclerosis, chronic glomerulonephritis, chronic transplantglomerulopathy, chronic interstitial nephritis, or polycystic kidneydisease. In certain embodiments, the cardiovascular disease isatherosclerosis, arteriosclerosis, dyslipidemia, hypercholesterolemia,or hypertriglyceridemia. In certain embodiments, the metabolic diseaseis insulin resistance, Type I and Type II diabetes, or obesity.

In another aspect, the present invention provides a pharmaceuticalcomposition comprising a compound of formula (I) and a pharmaceuticallyacceptable carrier or diluent.

In another aspect, the present invention provides a process forpreparing a compound of formula (I) and pharmaceutically acceptablesalts, solvates or amino acid conjugates thereof.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 shows the transactivation assay result in a graph format. Eachdata point is the average of triplicate assays. CTRL: control; INT-747:6-ECDCA; UPF-987.

FIG. 2 shows the dose response of INT-747 and UPF-987 in thetransactivation assay.

FIG. 3 shows FXR target gene expression in vitro. The result is the meanof two quantitative Real-Time PCR experiments.

FIG. 4 shows representative FXR target gene expression in cells derivedfrom mouse liver in vivo. The data is the mean of two quantitativeReal-Time PCR experiments.

FIG. 5 shows the effect of UPF-987 on weight loss induced by TNBS.

FIG. 6 shows the effect of UPF-987 on stool consistency.

FIG. 7 shows the effect of UPF-987 on mucosal damage score.

FIG. 8 shows the effect of UPF-987 on mouse colon genes expression. Theresult is the mean of two quantitative Real-Time PCR experiments.

FIG. 9 shows the effect of UPF-987 on plasmatic bilirubin inANIT-induced cholestasis.

FIG. 10 shows the effect of UPF-987 on plasmatic AST in ANIT-inducedcholestasis.

FIG. 11 shows the effect of UPF-987 on plasmatic ALP in ANIT-inducedcholestasis.

FIG. 12 shows the effect of UPF-987 on plasmatic gammaGT in ANIT-inducedcholestasis.

FIG. 13 shows the effect of UPF-987 on plasmatic cholesterol inANIT-induced cholestasis.

FIG. 14 shows the effect of UPF-987 on body weight in ANIT-inducedcholestasis.

FIG. 15 shows the effect of UPF-987 on liver weight in ANIT-inducedcholestasis.

FIG. 16 shows the effect of UPF-987 on FXR target genes expression inthe liver of ANIT-induced cholestatic rat. The result is the mean of twoquantitative Real-Time PCR experiments.

FIG. 17 shows the effect of INT-1103 on plasmatic bilirubin inANIT-induced cholestasic rats.

FIG. 18 shows the effect of INT-1103 on plasmatic AST in ANIT-inducedcholestasic rats.

FIG. 19 shows the effect of INT-1103 on plasmatic ALT in ANIT-inducedcholestasic rats.

FIG. 20 shows the effect of INT-1103 on plasmatic ALP in ANIT-inducedcholestasic rats.

FIG. 21 shows the effect of INT-1103 on plasmatic gammaGT inANIT-induced cholestasic rats.

FIG. 22 shows the effect of INT-1103 on body weight in ANIT-inducedcholestasic rats.

FIG. 23 shows the resulting liver ratio (liver weight/body weight×100).

FIG. 24 shows the effect of INT-1103 on plasmatic bilirubin inBDL-induced cholestasic rats.

FIG. 25 shows the effect of INT-1103 on plasmatic AST in BDL-inducedcholestasic rats.

FIG. 26 shows the effect of INT-1103 on plasmatic ALT in BDL-inducedcholestasic rats.

FIG. 27 shows the effect of INT-1103 on plasmatic ALP in BDL-inducedcholestasic rats.

FIG. 28 shows the effect of INT-1103 on plasmatic gammaGT in BDL-inducedcholestasic rats.

FIG. 29 shows the effect of INT-1103 on body weight in BDL-inducedcholestasic rats.

FIG. 30 shows the resulting liver ratio (liver weight/body weight×100).

FIG. 31 shows the effect of INT-1103 and INT-747 on bile flow in naïverats.

FIG. 32 shows the effect of INT-1103 and INT-747 on bile flow inestrogen colestatic rats.

FIG. 33 shows the effect of INT-1103 and INT-747 on liver ratio inestrogen colestatic rats.

FIG. 34 shows the effect of INT-1103 and INT-747 on body weight inestrogen colestatic rats.

FIG. 35 shows the resulting insulin gene expression by QuantitativeReal-Time PCR.

FIG. 36 shows the surface tension (dyne/cm) plotted against thelogarithm of the bile salt concentration (mM) in water.

FIG. 37 shows the surface tension (dyne/cm) plotted against thelogarithm of the bile salt concentration (mM) in NaCl 0.15 M.

FIG. 38 shows the secretion rate of taurine conjugated INT-747. Data arereported as concentration in bile and should be corrected by the bilevolume.

FIG. 39 shows the secretion rate of glycine conjugated INT-747. Data arereported as concentration in bile and should be corrected by the bilevolume.

FIG. 40 shows the secretion rate of INT-747. Data are reported asconcentration in bile and should be corrected by the bile volume.

FIG. 41 shows the secretion rate of INT-747 epimers. Data are reportedas concentration in bile and should be corrected by the bile volume.

FIG. 42 shows the secretion rate of taurine conjugated epimers ofINT-747. Data are reported as concentration in bile and should becorrected by the bile volume.

FIG. 43 shows the secretion rate of INT-1103. Data are reported asconcentration in bile and should be corrected by the bile volume.

FIG. 44 shows the secretion rate of INT-1103 and its main metabolite3-Glucuronides. The relative amount are expressed as analytical signal.Data are reported as concentration in bile and should be corrected bythe bile volume.

FIG. 45 shows the secretion rate of INT-1103 main metabolites identifiedin bile using mass spectrometry. Data are reported as concentration inbile and should be corrected by the bile volume.

FIG. 46 shows the secretion rate of INT-1103 main metabolites identifiedin bile using mass spectrometry zoom display. Data are reported asconcentration in bile and should be corrected by the bile volume.

FIG. 47 shows the metabolic stability of INT-747 and INT-1103 in humanstools cultures. Chenodeoxycholic was used as a reference naturalanalogue.

FIG. 48 shows the metabolic stability of INT-1103 in simulatedpancreatic fluid. Olive oil was used as a reference as reported in theUSP protocol. The compound is very stable and the ester bond (sulphate)is not hydrolyzed by pancreatic esterases, suggesting a high stabilityin human duodenal and upper intestine content.

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to compounds of general formula (I):

wherein R is hydrogen or alpha-hydroxy,

the hydroxyl group in position 7 is in the alpha or beta position;

and pharmaceutically acceptable salts, solvates or amino acid conjugatesthereof.

Suitable pharmaceutically acceptable salts according to the presentinvention will be readily determined by one skilled in the art and willinclude, for example, basic salts such as alkali or alkaline-earthmetallic salts made from aluminium, calcium, lithium, magnesium,potassium, sodium, and zinc or organic salts made fromN,N′-dibenzylethylenediamine, chlorprocaine, choline, diethanolamine,ethylendiamine, meglumine (N-methylglucamine), and procaine. Salts withpharmaceutically acceptable amines such as lysine, arginine,tromethamine, triethylamine and the like can also be used. Such salts ofthe compounds of formula (I) may be prepared using conventionaltechniques, from the compound of Formula (I) by reacting, for example,the appropriate base with the compound of Formula (I).

When used in medicine, the salts of a compound of formula (I) should bepharmaceutically acceptable, but pharmaceutically unacceptable salts mayconveniently be used to prepare the corresponding free base orpharmaceutically acceptable salts thereof.

As used herein, the term “solvate” is a crystal form containing thecompound of formula (I) or a pharmaceutically acceptable salt thereofand either a stoichiometric or a non-stoichiometric amount of a solvent.Solvents, by way of example, include water, methanol, ethanol, or aceticacid. Hereinafter, reference to a compound of formula (I) is to anyphysical form of that compound, unless a particular form, salt orsolvate thereof is specified.

As used herein, the term “amino acid conjugates” refers to conjugates ofthe compounds of formula (I) with any suitable amino acid. Preferably,such suitable amino acid conjugates of the compounds of formula (I) willhave the added advantage of enhanced integrity in bile or intestinalfluids. Suitable amino acids include but are not limited to glycine andtaurine. Thus, the present invention encompasses the glycine and taurineconjugates of any of the compounds of formula (I).

In one embodiment, the compound of formula I is a chenodeoxycholic acidderivative, wherein the hydroxyl group in 7 is in the alpha position andR is hydrogen.

In another embodiment, the compound of formula I is a ursodeoxycholicacid derivative, wherein the hydroxyl group in 7 is in the beta positionand R is hydrogen.

In another embodiment, the compound of formula I is a cholic acidderivative, wherein the hydroxyl group in 7 is in the alpha position andR is alpha-hydroxy.

Hereinafter all references to “compounds of formula (I)” refer tocompounds of formula (I) as described above together with their andpharmaceutically acceptable salts, solvates or amino acid conjugatesthereof.

The compounds of formula I may be prepared starting from the6-ethyl-7-keto-cholic acids, prepared as disclosed in EP 1392714 and EP1568796, suitably protected at the 3-hydroxy moiety, by a reactionsequence comprising the transformation of the C24 carboxy group into aiodine atom, the conversion of the latter into an hydroxyl group,reduction of the 7-keto group to give the corresponding 3-alpha or3-beta hydroxyl group, the selective sulfonylation of the C24 hydroxygroup and the deprotection of the 3-hydroxy group.

The reaction scheme and the reagents used in each step are reported inthe following scheme showing the preparation of3α,7α,23-trihydroxy-6α-ethyl-24-nor-5β-cholan-23-sulphate in the form oftriethylammonium salt (UPF-987 or compound (9) below). The same schememay be adapted, by suitably substituting the reagents and/or startingmaterials and optionally by also changing reaction sequences andprotective groups, for the preparation of other compounds of formula I.

The reaction scheme and the reagents used in each step are reported inthe following scheme below showing the preparation of3α,7α,23-trihydroxy-6α-ethyl-24-nor-5β-cholan-23-sulphate in the form ofsodium salt (INT-1103 or compound (10) below). The same scheme may beadapted, by suitably substituting the reagents and/or starting materialsand optionally by also changing reaction sequences and protectivegroups, for the preparation of other pharmaceutically acceptable saltforms of formula I.

As explained in greater detail in the experimental section, compound 9was tested in a cell-free assay and transactivation assay in a humanhepatocyte cell line and in vivo in intact mice and rats renderedcholestatic by administration of alfanafthylsiotiocyanate (ANIT). In theFRET assay, the compound was found to be approximately 1000 fold morepotent than chenodeoxycholic acid (CDCA) in activating FXR. In thetranactivation assay Compound 9 caused 2 fold induction of bile acidtransporter, BSEP (bile salt export pump) and the small heterodimericpartner (SHP, an atypical nuclear receptor that lacks a DNA-bindingdomain). Further it potently suppressed Cyp7A1, SREPB-1c and the fattyacid synthase (FAS), thus indicating that FXR activation by the compoundof the invention allows selective modulation of genes involved in bileacid synthesis as well as in lipid, cholesterol and glucose metabolism.Therefore, compounds of formula (I) act as selective modulators of thebile acid transporters and increase the flux of biliary acids in theliver; furthermore, they potently regulate genes involved in lipid andcholesterol metabolism and for this reason they can be used for theprevention or treatment of FXR-mediated diseases or conditions, whichinclude chronic liver disease (involving one or more of cholestasis,steatosis, inflammation, fibrosis, and cirrhosis), gastrointestinaldisease, renal disease, cardiovascular disease, and metabolic disease.Chronic liver diseases which may be prevented or treated using compoundsof formula (I) include but are not limited to primary biliary cirrhosis(PBC), primary sclerosing cholangitis (PSC), cerebrotendinousxanthomatosis (CTX), drug induced cholestasis, intrahepatic cholestasisof pregnancy, parenteral nutrition associated cholestasis (PNAC),bacterial overgrowth or sepsis associated cholestasis, autoimmunehepatitis, chronic viral hepatitis, alcoholic liver disease,nonalcoholic fatty liver disease (NAFLD), nonalcoholic steatohepatitis(NASH), liver transplant associated graft versus host disease, livingdonor transplant liver regeneration, congenital hepatic fibrosis,choledocholithiasis, granulomatous liver disease, intra- or extrahepaticmalignancy, Sjogren's syndrome, Sarcoidosis, Wilson's disease, Gaucher'sdisease, hemochromatosis, and alpha 1-antitrypsin deficiency.Gastrointestinal diseases which may be prevented or treated usingcompounds of formula (I) include but are not limited to inflammatorybowel disease (IBD) (including Crohn's disease and ulcerative colitis),irritable bowel syndrome (IBS), bacterial overgrowth, malabsorption,post-radiation colitis, and microscopic colitis. Renal diseases whichmay be prevented or treated using compounds of formula (I) include butare not limited to diabetic nephropathy, focal segmentalglomerulosclerosis (FSGS), hypertensive nephrosclerosis, chronicglomerulonephritis, chronic transplant glomerulopathy, chronicinterstitial nephritis, and polycystic kidney disease. Cardiovasculardiseases which may be prevented or treated using compounds of formula(I) include but are not limited to atherosclerosis, arteriosclerosis,dyslipidemia, hypercholesterolemia, and hypertriglyceridemia. Metabolicdiseases which may be prevented or treated using compounds of formula(I) include but are not limited to insulin resistance, Type I and TypeII diabetes, and obesity.

The methods of the present invention comprise the step of administeringa therapeutically effective amount of a compound of formula (I). As usedherein, the term “therapeutically effective amount” refers to an amountof a compound of formula (I) which is sufficient to achieve the statedeffect. Accordingly, a therapeutically effective amount of a compound offormula (I) used in a method for the prevention or treatment of FXRmediated diseases or conditions will be an amount sufficient to preventor treat the FXR mediated disease or condition. Similarly, atherapeutically effective amount of a compound of formula (I) for use ina method for the prophylaxis or treatment of cholestatic liver diseasesor increasing bile flow will be an amount sufficient to increase bileflow to the intestine.

The amount of the compound of formula (I) which is required to achievethe desired biological effect will depend on a number of factors such asthe use for which it is intended, the means of administration, and therecipient, and will be ultimately at the discretion of the attendantphysician or veterinarian. In general, a typical daily dose for thetreatment of FXR mediated diseases and conditions, for instance, may beexpected to lie in the range of from about 0.01 mg/kg to about 100mg/kg. This dose may be administered as a single unit dose or as severalseparate unit doses or as a continuous infusion. Similar dosages wouldbe applicable for the treatment of other diseases, conditions andtherapies including the prophylaxis and treatment of cholestatic liverdiseases.

Thus, in a further aspect, the present invention provides pharmaceuticalcompositions comprising, as active ingredient, a compound of formula (I)together, and/or in admixture, with at least one pharmaceutical carrieror diluent. These pharmaceutical compositions may be used in theprophylaxis and treatment of the foregoing diseases or conditions.

The carrier must be pharmaceutically acceptable and must be compatiblewith, i.e. not have a deleterious effect upon, the other ingredients inthe composition. The carrier may be a solid or liquid and is preferablyformulated as a unit dose formulation, for example, a tablet which maycontain from 0.05 to 95% by weight of the active ingredient. If desired,other physiologically active ingredients may also be incorporated in thepharmaceutical compositions of the invention.

Possible formulations include those suitable for oral, sublingual,buccal, parenteral (for example subcutaneous, intramuscular, orintravenous), rectal, topical including transdermal, intranasal andinhalation administration. Most suitable means of administration for aparticular patient will depend on the nature and severity of the diseaseor condition being treated or the nature of the therapy being used andon the nature of the active compound, but where possible, oraladministration is preferred for the prevention and treatment of FXRmediated diseases and conditions.

Formulations suitable for oral administration may be provided asdiscrete units, such as tablets, capsules, cachets, lozenges, eachcontaining a predetermined amount of the active compound; as powders orgranules; as solutions or suspensions in aqueous or non-aqueous liquids;or as oil-in-water or water-in-oil emulsions.

Formulations suitable for sublingual or buccal administration includelozenges comprising the active compound and, typically a flavoured base,such as sugar and acacia or tragacanth and pastilles comprising theactive compound in an inert base, such as gelatine and glycerine orsucrose acacia.

Formulations suitable for parenteral administration typically comprisesterile aqueous solutions containing a predetermined concentration ofthe active compound; the solution is preferably isotonic with the bloodof the intended recipient. Additional formulations suitable forparenteral administration include formulations containingphysiologically suitable co-solvents and/or complexing agents such assurfactants and cyclodextrins. Oil-in-water emulsions are also suitableformulations for parenteral formulations. Although such solutions arepreferably administered intravenously, they may also be administered bysubcutaneous or intramuscular injection.

Formulations suitable for rectal administration are preferably providedas unit-dose suppositories comprising the active ingredient in one ormore solid carriers forming the suppository base, for example, cocoabutter.

Formulations suitable for topical or intranasal application includeointments, creams, lotions, pastes, gels, sprays, aerosols and oils.Suitable carriers for such formulations include petroleum jelly,lanolin, polyethyleneglycols, alcohols, and combinations thereof.

Formulations of the invention may be prepared by any suitable method,typically by uniformly and intimately admixing the active compound withliquids or finely divided solid carriers or both, in the requiredproportions and then, if necessary, shaping the resulting mixture intothe desired shape.

For example a tablet may be prepared by compressing an intimate mixturecomprising a powder or granules of the active ingredient and one or moreoptional ingredients, such as a binder, lubricant, inert diluent, orsurface active dispersing agent, or by moulding an intimate mixture ofpowdered active ingredient and inert liquid diluent.

Suitable formulations for administration by inhalation include fineparticle dusts or mists which may be generated by means of various typesof metered dose pressurised aerosols, nebulisers, or insufflators.

For pulmonary administration via the mouth, the particle size of thepowder or droplets is typically in the range 0.5-10 μm, preferably 1-5μm, to ensure delivery into the bronchial tree. For nasaladministration, a particle size in the range 10-500 μm is preferred toensure retention in the nasal cavity.

Metered dose inhalers are pressurised aerosol dispensers, typicallycontaining a suspension or solution formulation of the active ingredientin a liquefied propellant. During use, these devices discharge theformulation through a valve adapted to deliver a metered volume,typically from 10 to 150 μl, to produce a fine particle spray containingthe active ingredient. Suitable propellants include certainchlorofluorocarbon compounds, for example, dichlorodifluoromethane,trichlorofluoromethane, dichlorotetrafluoroethane and mixtures thereof.The formulation may additionally contain one or more co-solvents, forexample, ethanol surfactants, such as oleic acid or sorbitan trioleate,anti-oxidants and suitable flavouring agents.

Nebulisers are commercially available devices that transform solutionsor suspensions of the active ingredient into a therapeutic aerosol misteither by means of acceleration of a compressed gas typically air oroxygen, through a narrow venturi orifice, or by means of ultrasonicagitation. Suitable formulations for use in nebulisers consist of theactive ingredient in a liquid carrier and comprise up to 40% w/w of theformulation, preferably less than 20% w/w. The carrier is typicallywater or a dilute aqueous alcoholic solution, preferably made isotonicwith body fluids by the addition of, for example, sodium chloride.Optional additives include preservatives if the formulation is notprepared sterile, for example, methyl hydroxy-benzoate, anti-oxidants,flavouring agents, volatile oils, buffering agents and surfactants.

Suitable formulations for administration by insufflation include finelycomminuted powders which may be delivered by means of an insufflator ortaken into the nasal cavity in the manner of a snuff. In theinsufflator, the powder is contained in capsules or cartridges,typically made of gelatin or plastic, which are either pierced or openedin situ and the powder delivered by air drawn through the device uponinhalation or by means of a manually-operated pump. The powder employedin the insufflator consists either solely of the active ingredient or ofa powder blend comprising the active ingredient, a suitable powderdiluent, such as lactose, and an optional surfactant. The activeingredient typically comprises from 0.1 to 100 w/w of the formulation.

In addition to the ingredients specifically mentioned above, theformulations of the present invention may include other agents known tothose skilled in the art of pharmacy, having regard for the type offormulation in issue. For example, formulations suitable for oraladministration may include flavouring agents and formulations suitablefor intranasal administration may include perfumes.

Therefore, according to a further aspect of the present invention, thereis provided the use of the compounds of formula (I) in the preparationof medicaments for the prevention or treatment of FXR mediated diseasesor conditions.

The invention will be hereinafter illustrated in more detail in thefollowing Examples.

Example 1 Chemistry

Melting points were determined with a Buchi 535 electrothermal apparatusand are uncorrected. NMR spectra were obtained with a Bruker AC 200 MHzspectrometer, and the chemical shifts are reported in parts per million(ppm). The abbreviations used are as follows: s, singlet; bs, broadsinglet; d, doublet; dd, double doublet; m, multiplet; q, quartet, t,triplet. Flash column chromatography was performed using Merck silicagel 60 (0.040-0.063 mm). TLC was carried out on precoated TLC plateswith silica gel 60 F-254 (Merck). Spots were visualized withphosphomolybdate reagent (5% solution in EtOH). The reactions werecarried out under a nitrogen atmosphere.

3α-Tetrahydropyranyloxy-7-keto-5β-cholan-24-oic Acid (2)

3,4-dihydro-2H-pyrane (1.74 ml, 19 mmol) in dioxane (12 ml) was droppedslowly to a solution of p-Toluenesulfonic acid (115 mg, 0.6 ml) and6α-ethyl-7-ketolithocholic acid (5.0 g, 12 mmol) in dioxane (55 ml). Thereaction mixture was stirred at room temperature for 2 hours. Water (40ml) was then added, and the mixture was partially concentrated undervacuum and extracted with EtOAc (4×25 ml). The combined organicfractions were washed with brine (1×50 ml), dried over anhydrous Na₂SO₄and evaporated under vacuum to afford 6 g of compound 2. The crudederivative was used for the next step without further purification.

¹H NMR: (200 MHz, CDCl₃) δ: 0.68 (3H, s, C-18 Me); 0.8 (3H, t, J=4 Hz,C-26); 0.98 (3H, d, J=6.5, C-21 Me); 1.17 (3H, s, C-19 Me); 3.4-3.7 (4H,m, C-23 CH₂, C-6′); 3.8-3.9 (1H, m, C-3); 2.6-2.8 (1H, m, C-6).

¹³C NMR (50.3 MHz, CDCl₃) δ: 212.41, 179.42, 54.75, 52.10, 21.79, 18.30,12.04.

3α-Tetrahydropyranyloxy-7-keto-24-nor-5β-cholan-23-I (3)

Under irradiation with a 300 w tungsten lamp, iodine (5 g, 20 mmol) inCCl₄ (75 ml) was added dropwise to a solution of 2 (5.5 g, 11 mmol) andlead tetra-acetate (4.9 g, 11 mmol) in CCl₄ (200 ml). The reactionmixture was stirred until the colour was permanent (18 h). The mixturewas cooled and filtered on celite. The organic phase was washed with a5% Na₂S₂O₃ solution, 5% NaOH, brine (15 ml), dried over anhydrous Na₂SO₄and evaporated under vacuum. The residue was purified by silica gelflash chromatography using a mixture of light petroleum/EtOAc 95/5 asmobile phase to give 4.6 g of compound 3 (40% yield).

¹H NMR: (200 MHz, CDCl₃) δ: 0.54 (3H, s, C-18 Me); 0.68 (3H, t, J=7.36MHz, C-25); 0.79 (3H, d, J=5.2 MHz, C-21); 1.09 (3H, s, C-19); 2.55 (1H,m, C-26); 2.96 (1H, m, C-23); 3.16 (1H, m, C-23); 3.20 (1H, m, C-6′);3.76 (1H, m, C-6′); 4.59 (1H, m, C-2′).

¹³C NMR (50.3 MHz, CDCl₃) δ: 212.50, 96.56, 95.99, 74.90, 74.60, 62.63,54.63, 52.08, 50.78, 50.58, 49.84, 48.91, 43.38, 42.70, 40.11, 38.90,36.92, 35.81, 34.34, 34.10, 31.07, 30.06, 29.61, 28.26, 27.85, 25.97,25.42, 24.54, 23.49, 21.75, 19.76, 19.59, 18.88, 17.84, 12.05, 11.98,5.26.

3α-hydroxy-6α-ethyl-7-keto-24-nor-5β-cholan-23-I (4)

The compound 3 (2.2 g, 3.8 mmol) was stirred in a solution of HCl 37% inTHF (50 ml) overnight at room temperature. The reaction mixture waswashed with a saturated solution of NaHCO₃ (20 ml), H₂O (20 ml), brine(20 ml) dried over Na₂SO₄ and evaporated under vacuum to afford 1.4 g ofcompound 4 (80% yield). The crude derivative was used for the next stepwithout further purification.

¹H NMR: (200 MHz, CDCl₃) δ: 0.68 (3H, s, C-18 Me); 0.82 (3H, t, J=7.36MHz, C-21); 0.93 (3H, t, J=5.2 Hz, C-21 Me); 1.26 (3H, s, C-19 Me); 3.08(1H, m, C-23); 3.37 (1H, m, C-23); 3.61 (1H, m, C-3).

¹³C NMR (50.3 MHz, CDCl₃) δ: 212.81, 71.09, 54.63, 51.93, 50.60, 49.84,48.93, 43.64, 42.70, 40.11, 38.92, 36.92, 35.63, 34.19, 31.71, 31.06,29.78, 28.25, 27.89, 25.96, 25.42, 24.51, 23.48, 21.79, 19.56, 18.77,18.22, 17.85, 12.02, 11.95, 5.22.

3α-tert-Buthyldimethylsilyloxy-6α-ethyl-7-keto-24-nor-5β-cholan-23-I (5)

To a solution of 4 (1.4 g, 2.8 mmol) in CH₂Cl₂ (30 ml),tert-butyldimethylsilylchloride (496 mg, 3.22 mmol) and imidazole (230mg, 3.36 mmol) were added and the mixture was stirred overnight at roomtemperature. The reaction mixture was washed with a saturated solutionof NaHCO₃ (30 ml), brine (30 ml), and dried over anhydrous Na₂SO₄. Theorganic phase was evaporated under vacuum to afford 1.5 g of compound 5(87% yield). The crude derivative was used for the next step withoutfurther purification.

¹H NMR: (200 MHz, CDCl₃) δ: 0.02 (6H, s, (CH₃)₂Si); 0.65 (3H, s, C-18Me); 0.85 (9H, s, (CH₃)₃CSi); 1.19 (3H, s, C-19); 3.16 (1H, m, C-23);3.30 (1H, m, C-23); 3.48 (1H m, C-3).

¹³C NMR (50.3 MHz, CDCl₃) δ: 212.56, 71.93, 54.63, 51.89, 50.62, 49.81,48.90, 43.34, 42.72, 40.11, 38.89, 36.92, 35.62, 34.37, 31.97, 30.34,28.26, 25.83, 25.61, 24.57, 23.48, 21.77, 18.81, 17.84, 12.02, 11.92,5.27, −4.70.

3α-tert-Buthyldimethylsilyloxy-6α-ethyl-7-keto-24-nor-5β-cholan-23-ole(6)

To a solution of 5 (1.2 g, 1.96 mmol) in acetone (12 ml), Ag₂CO₃ (1.1 g,3.9 mmol) was added. The reaction mixture was refluxed overnight andthen cooled to r.t., filtered on celite washed with acetone and thecombined organic phases were concentrated to yield 1 g of compound 6.The crude derivative was used for the next step without furtherpurification.

¹H NMR: (200 MHz, CDCl₃) δ: 0.02 (6H, s, (CH₃)₂Si); 0.65 (3H, s, C-18Me); 0.88 (9H, s, (CH₃)₃CSi); 3.16 (1H, m, C-23); 3.37 (1H m, C-3); 3.69(2H, m, C-23).

¹³C NMR (50.3 MHz, CDCl₃) δ: 212.64, 71.96, 60.84, 55.27, 50.66, 49.87,48.94, 43.37, 42.69, 38.94, 35.64, 34.39, 32.70, 32.00, 30.36, 29.68,28.53, 25.85, 24.64, 23.50, 21.80, 18.84, 12.01, 11.94, −4.68.

3α-tert-Buthyldimethylsilyloxy-7α-hydroxy-6α-ethyl-24-nor-5β-cholan-23-ole(7)

To a solution of 6 (1 g, 1.96 mmol) in a mixture of THF (50 ml) and H₂O(12.5 ml), NaBH₄ (740 mg, 19.6 mmol) was added and the mixture wasstirred at room temperature for 1 hours and 30 minutes. The reactionsolution was partially concentrated under vacuum and extracted withCHCl₃ (3×20 ml). The combined organic layers were washed with brine(1×50 ml), dried over anhydrous Na₂SO₄, and evaporated under vacuum. Thecrude residue was purified by silica gel flash chromatography using amixture of CH₂Cl₂:MeOH 99:1 as mobile phase to give 0.8 g of 7 (81%yield).

¹H NMR: (200 MHz, CDCl₃) δ: 0.04 (6H, s, (CH₃)₂Si); 0.66 (3H, s, C-18Me); 0.88 (9H, s, (CH₃)₃CSi); 3.16 (1H, m, C-23); 3.37 (1H m, C-3); 3.69(1H, m, C-7, 2H, m, C-23).

¹³C NMR (50.3 MHz, CDCl₃) δ: 73.30, 70.85, 60.82, 56.31, 50.55, 45.28,42.77, 41.17, 40.03, 39.62, 38.95, 35.74, 35.52, 34.10, 33.14, 32.93,31.01, 28.40, 25.98, 2170, 23.18, 22.22, 20.72, 18.79, 11.62, −4.60.

3α-tert-Buthyldimethylsilyloxy-7α-hydroxy-6α-ethyl-24-nor-5β-cholan-23-sulphatetriethyl ammonium salt (8)

To a solution of 7 (0.5 g, 0.99 mmol) in THF (7 ml) cooled at −3° C.,Et₃N (0.3 ml, 2.1 mmol) was added and the resulting mixture was stirredfor 10 min. ClSO₃H (0.1 ml, 1.5 mmol) was added and the mixture wasstirred overnight at room temperature. Water (10 ml) was then added andthe mixture was extracted with CH₂Cl₂ (3×15 ml), dried over anhydrideNa₂SO₄ and evaporated under vacuum. The crude sulphate derivative wasused for the next step without further purification.

3α,7α,23-trihydroxy-6α-ethyl-24-nor-5β-cholan-23-sulphate triethylammonium salt (9)

To a solution of 8 (0.5 g, 0.77 mmol) in acetone (8 ml), PdCl₂(CH₃CN)₂(10 mg, 0.05 eq) was added and the mixture was stirred at roomtemperature for 3 hours. The reaction mixture was filtered, concentratedunder vacuum and purified by medium pressure Lichroprep RP-8 using aMeOH/H₂O 8/2 mixture as mobile phase to afford 0.115 g of 9, m p118-121° C.

¹H NMR (200 MHz, CD₃OD) δ: 0.70 (3H, s, C-18 Me); 0.91 (3H, m, C-21 Me,3H, C-25); 0.98 (3H, d, J=6.4 Hz, C-19 Me); 1.32 (9H, t, J=7.3 Hz,(CH₃—CH₂)₃N); 3.20 (6H, q, J=7.31 Hz, (CH₃—CH₂—)₃N, 3.31 (1H, m, C-3);3.65 (1H, bs, C-7); 4.03 (2H, m, CH₂-23).

¹³C NMR (CD₃OD) δ: 9.23, 12.05, 12.19, 19.14, 21.97, 23.52, 23.76,24.57, 34.23, 34.51, 36.56, 36.65, 36.79, 41.06, 41.55, 43.13, 47.73,50.28, 51.68, 57.80, 67.19, 71.16, 73.23.

3α,7α,23-trihydroxy-6α-ethyl-24-nor-5β-cholan-23-sulphate sodium salt(10)

To a solution of 8 (0.4 g, 0.72 mmol) in a mixture of acetone (4 ml) andH₂O (0.08 ml), PdCl₂(CH₃CN)₂ (10 mg, 0.05 eq) was added and theresulting mixture was stirred at room temperature for 3 hours. Thereaction mixture was filtered over celite and concentrated under vacuum.The resulting residue was treated with a methanolic solution of 10% NaOHfor 2 h. The resulting mixture was concentrated under vacuum andsubmitted to liquid medium pressure purification using a mixture ofCH₃OH/H₂O (7:3) as mobile phase to afford 0.09 g of 10 (25% yield).

Example 2 Biological Activities

Tests were first carried out in order to verify whether UPF-987modulates FXR-regulated genes, in comparison with chenodeoxycholic acid(CDCA). CDCA is a primary bile acid that functions as an endogenousligand of the farnesoid-x-receptor (FXR; NR1H4). The biological activityof UPF-987 on FXR activity was first tested in an in vitro assay usingthe fluorescence resonance energy transfer (FRET) cell free assay,described in Pellicciari R., et al. J Med. Chem. 2002 15; 45:3569-72.

Briefly, reactions contained europium-labeled anti-GST antibody andstreptavidin-conjugated allophycocyanin, FXR GST-LBD fusion proteins andbiotinylated SRC1 sensor peptide. Reactions were incubated at roomtemperature for 1 h in FRET buffer (10 mM Hepes, pH 7.9, 150 mM NaCl, 2mM MgCl2, 1 mM EDTA, 0.1 mg/ml BSA). FRET was measured on a Victor 1420multilabel counter.

In the FRET cell-free assay, the recruitment of Scr-1, a co-activatingfactor for FXR, occurs at a concentration of compound that is almost300-fold lower than that required for the natural FXR-ligand CDCA (Table1).

TABLE 1 Activity of UPF-987 on Human FXR on FRET Compound Cell-FreeAssay Tested EC₅₀ (μM) Efficacy¹ UPF-987 0.014 111 CDCA 4 100 ± 3¹Relative recruitment of the SRC1 peptide to FXR where CDCA = 100%.

All data are mean±SE, n=4.

It was also evaluated if UPF-987 modulated FXR-regulated genes in acellular assay using a human hepatocyte cell line (HepG2). In a celltransfection assay using the HepG2 cell line, UPF-987 proved a potentFXR ligand. Exposure of HepG2 cells to UPF-987 transactivates FXR. Inother experiments using liver cells transfected with viral constructscarrying the FXR gene or other nuclear receptors cloned upstream to theluciferase gene, it was found that UPF-987 functions as a selective FXRligand in mouse, rat, and human hepatocytes. A detailed description ofthese methods can be found in the following reference: Fiorucci S., etal. Gastroenterology 2004.

Briefly, for luciferase assay, HepG2 cells were cultured in E-MEMsupplemented with 1% penicillin/streptomycin, 1% L-glutamine and 10%fetal bovine serum (high glucose) (CELBIO). Cells were grown at 37° C.in 5% CO₂. All the transfections were making using a calcium phosphatecoprecipitation method in the presence of 25 μM chloroquine as inhibitorfor DNA degradation. Transient transfections were performed using 500 ngof reporter vector phsp27-TKLUC, 200 ng pCMV-βgal, as internal controlfor transfection efficiency, and 50 ng of each receptor expressionplasmid pSG5-FXR, pSG5-RXR. The pGEM vector was added to normalize theamounts of DNA transfected in each assay (2.5 μg). The transfectionefficiency was evaluated by β-gal expression, obtained byco-transfecting the cells with pCMV-β-gal plasmid. Forty-Eight hourspost-transfection, HepG2 cells were stimulated with 1 μM UPF-987 for 18h. Control cultures received vehicle (0.1% DMSO) alone. Cells were lysedin 100 μl diluted reporter lysis buffer (Promega), and 0.2 μl cellularlisate was assayed for luciferase activity using Luciferase Assay System(Promega). Luminescence was measured using an automated luminometer.Luciferase activities were normalized for transfection efficiencies bydividing the relative light units by β-galactosidase activity.

Regulation of FXR Target Gene Expression by UPF-987 in HepG2 Cells

To establish if UPF-987 is a FXR modulator and exerts differentialactivities, human HepG2 cells were exposed to UPF-987, CDCA (natural FXRligand) and to its 6-ethyl-derivative, 6-ECDCA, which is a potent FXRligand. The effects of these ligands on FXR responsive genes was theninvestigated by quantitative reverse transcription PCR (qRT-PCR).

Briefly, all PCR primers were designed using PRIMER3-OUTPUT softwareusing published sequence data from the NCBI database. Total RNA wasisolated (TRIzol reagen, Invitrogen srl, Milan, Italy) from specimenstaken from livers. One microgram of purified RNA was treated with DNAseI for 10 minutes at room temperature, followed by incubation at 95° C.for 3 minutes in the presence of 2.5 mmol/L EDTA. The RNA was reversetranscribed with Superscript III (Invitrogen, Carsbad, Calif.) in 20 μLreaction volume using random primers. For quantitative RT-PCR, 100 ngtemplate was dissolved in a 25 μL containing 0.3 μmol/L of each primerand 12.5 μL of 2×SYBR Green PCR Master mix (Fynnzimes-DyNAmo SYBRR GreenqPCR mix). All reactions were performed in triplicate, and the thermalcycling conditions were as follows: 2 minutes at 95° C., followed by 50cycles of 95° C. for 20 seconds, 55° C. for 20 seconds and 72° C. for 30seconds on iCycler iQ instrument (Bio-Rad, Hercules, Calif.). The meanvalue of the replicates for each sample was calculated and expressed asthe cycle threshold (CT; cycle number at which each PCR reaction reachesa predetermined fluorescent threshold, set within the linear range ofall reactions). The amount of gene expression was then calculated as thedifference (ΔCT) between the CT value of the sample for the target geneand the mean CT value of that sample for the endogenous control (GAPDH).Relative expression was calculated as the difference (ΔΔCT) between OCTvalues of the test control sample for each target gene. The relativemRNA expression was shown as 2-ΔΔCT (FIG. 3). The Primers (SEQ ID NOS.:1-10) used in Real-Time PCR were:

Hgapdh: (SEQ ID NOS.: 1 & 2): gaaggtgaaggtcggagt andcatgggtggaatcatattggaa; hCYP7A1: (SEQ ID NOS.: 3 & 4):caccttgaggacggttccta and cgatccaaagggcatgtagt;Hshp: (SEQ ID NOS.: 5 & 6): gctgtctggagtccttctgg andccaatgatagggcgaaagaagag; Hbsep: (SEQ ID NOS.: 7 & 8):gggccattgtacgagatcctaa and tgcaccgtcttttcactttctg;hSREBP1c: (SEQ ID NOS.: 9 & 10): gcaaggccatcgactacatt andggtcagtgtgtcctccacct.

In contrast to FIG. 3, a different in vitro experiment usingquantitative reverse transcription PCR, demonstrated that while nodirect cell toxicity was observed upon exposure to any of these ligands,exposure of HepG2 cells to CDCA and its 6-ECDCA derivative, resulted ina 2-3 fold induction of SHP, an FXR regulated gene. By contrast, despitethe fact that UPF-987 is a FXR ligand (see above), it stimulates SHPexpression. All the FXR ligands tested, namely CDCA, 6-ECDCA and UPF-987exerted the same effect on CYP7α1 (all agents caused a 60-70% reductionof the expression of CYP7β1 mRNA). In addition, exposure to UPF-987induced BSEP and SHP mRNA expression (approximately 2-3 fold induction).This effect was significantly more pronounced with UPF-987 than with theother FXR ligands. Furthermore, similarly to the other ligands, exposureto UPF-987 resulted in a potent inhibition of SREPB-1c and FAS mRNAexpression. Taken together, these data suggest that UPF-987 is an FXRmodulator that functions as a potent FXR ligand, and unexpectedly altersFXR regulated genes, causing significant induction of bile acidtransporters (for example BSEP) and potent suppression of lipid-relatedgenes. In addition, UPF-987 represses the expression of Cyp7α1, a genethat is critically involved in bile acid synthesis from cholesterol. Theregulation of these FXR target genes suggests that UPF-987 is agene-selective FXR ligand that may inhibit bile acid biosynthesisthrough the classical pathway while increasing bile acid secretion fromhepatocytes, without interfering with SHP expression. This effect isdesirable, since it narrows the pharmacological activities of these FXRligands, and might prevent metabolic activation typically associatedwith SHP induction.

Results of In vitro pharmacology studies on UPF-987 are shown in Table 2below.

TABLE 2 In Vitro Pharmacology Studies on UPF-987 Test Summary CellsArticle Doses Species Endpoints Findings Cell free UPF- Concentrationsn/a Potency of The results of assay 987 ranging from 1 nM UPF-987 asthese experiments CDCA to 100 μM an FXR show that UPF- ligand in a 987is a potent cell free ligand of FXR assay using (EC₅₀ ~14 nM) FRET assayHepatoma UPF- Concentrations Human Potency on UPF-987 causes cell 987ranging from 1 regulation of transactivation of line(HepG2) CDCA to 100μM FXR and FXR. 6- FXR UPF-987 is a ECDCA regulated potent inducer ofgenes (SHP, BSEP and SHP. CYP7α1, UPF-987 is potent CYP8β1, inhibitor ofSREPB1c, Cyp7A1 and FAS and SREBP1c mRNA BSEP) expression In vivo UPF- 5mg/kg Mice Regulation UPF-987 testing 987 intraperitoneal of FXRadministration Intact CDCA 4 days related induces liver mouse 6E- genes(SHP, expression of CDCA CYP7α1, BSEP and SHP CYP8β1, and inhibits liverSREPB1c, Cyp7A1, FAS and SREBP1c and BSEP) in FAS mRNA vivo expressionIn vivo UPF- 5 mg/kg oral Rats Biochemical UPF-987 testing 987 7 daysassessment administration ANIT- administration of reduces ANIT inducedcholestasis induced cholestasis cholestasis as measured by serum liverenzymes (AST, bilirubin, Alc. Phosphatase and cholesterol) and modulatesliver expression of NTCP, BSEP and CYP7A1 mRNA expression

Example 3 Regulation of FXR Target Genes by UPF-987 In Vivo

Background

Compound 9 is also referred to as UPF-987. FXR plays a key role in thetranscriptional regulation of genes involved in bile acid metabolism andlipid/cholesterol and glucose homeostasis. The regulation of theseinteractions is highly complex and contains multiple feedback loops toself-regulate the transcriptional circuits. The overlapping range ofagonistic and antagonistic ligands, as well as of target genes shared byFXR with other metabolic nuclear receptors including PPARs and LXR, mayserve as a redundant safety mechanism to elicit a protective response sothat even when one pathway is compromised, a salvage pathway takes over.Crucial to the complexity of putative convergent and divergent functionsof the metabolic nuclear receptors are their transcriptionalcoactivators and corepressors, that will be recruited in various mannerfrom FXR modulators.

FXR modulators will be used for the treatment of the inflammatory,cholestatic, fibrotic liver disorders, and metabolic disorders includinghypertriglyceridemic and hypercholesterolemic states and, by extension,atherosclerosis and its complications.

In conclusion, FXR is emerging as a particularly intriguing therapeutictarget, not only for the promising application associated with itsmodulation but also for its peculiar mechanism of ligand recognition andgene activation.

Materials and Methods

Animals

Six- to eight-week old female Balb/c mice were obtained from CharlesRiver (Charles River Laboratories, Inc., Wilmington, Mass.). Animalswere fed a standard chow pellet diet, had free access to water, and weremaintained on a 12-h light/dark cycle. All procedures in this study wereapproved by the Animal Study Committees of the University of Perugia(Italy) according to governmental guidelines for animal care. Animalswere treated for 5 days by intraperitoneal injection of 6-ECDCA 5mg/Kg/day, while control animals were treated with vehicle alone(methyl-cellulose). At the end of the experiment mice were sacrificedand liver was removed to perform Real Time PCR analysis of FXR targetgenes.Quantitative Real-Time PCR

Quantitative Real-Time PCR was performed as above (see 1.1 Materials andMethods). The primers (SEQ ID NOS.: 11-20) used were:

Mgapdh (SEQ ID NOS.: 11 & 12): ctgagtatgtcgtggagtctac andgttggtggtgcaggatgcattg Mbsep (SEQ ID NOS.: 13 & 14):aaatcggatggtttgactgc and tgacagcgagaatcaccaagmSHP (SEQ ID NOS.: 15 & 16): tctcttatccgccctatca andaagggcttgctggacagtta mCYP7A1 (SEQ ID NOS.: 17 & 18):aagccatgatgcaaaacctc and gccggaaatacttggtcaaamSREBP1c (SEQ ID NOS.: 19 & 20): gatcaaagaggagccagtgc andtagatggtggctgctgagtgResults

In vivo administration of the UPF-987 to intact mice for 4 days at thedose of 5 mg/kg resulted in a potent induction of BSEP and SHP in theliver. Despite encouraging yet inconsistent target gene expression datawith preliminary in vitro assays discussed above, the observed in vivodata suggest potent downregulation (60-70% reduction) of Cyp7a1. UPF-987which also caused 90% inhibition of SREBP-1c and reduced FAS mRNAexpression in the liver (FIG. 5).

Example 4 Evaluation of UPF-987 Anti-Inflammatory Activity in TNBS MouseModel of Colitis

Materials and Methods

Colitis Models

The intracolonic application of the hapten TNBS causes acute and chroniccolitis in rodents. Mucosal inflammation in TNBS-colitis has a prominentneutrophilic infiltrate, but also comprises influx of CCR1+ and CCR5+macrophages and monocytes as well as a prominent IL-12 and IFN-dependentT lymphocyte (Th1) activation. Histopathological features resemble humanCrohn's disease, transmural inflammation, granulomas, fissuring ulcersand “skip lesions” (regions of ulceration separated by regions of normalmucosa”. TNBS-colitis serves as a useful pre-clinical model for testingestablished and innovative treatments for Crohn's disease.

Animals

Animals were monitored daily for appearance of diarrhea, loss of bodyweight, and survival. At the end of the experiment, surviving mice weresacrificed, blood samples collected by cardiac puncture, and a 7 cmsegment of colon was excised, weighed, and macroscopic damage wasevaluated.

Induction of Colitis and Study Design

Colitis was induced in BALB/c mice (8 weeks old) by intra-rectaladministration of TNBS (0.5 mg/mouse) Beginning three hours later andcontinuing at 24-h intervals for five days, the mice were administeredintra-peritoneally, UPF-987 (0.3-1-3 mg/kg) or vehicle (methyl cellulose1%). Each group consisted of 5 or 7 mice.

The mice were sacrificed 18 h after the final administration of the testdrug or vehicle. The severity of colitis was scored by assessing themacroscopic appearance. The latter is an index of granulocyteinfiltration in the tissue. The macroscopic scoring of colitis has beendescribed in detail by Fiorucci et al, and involved blind scoring on a 0(normal) to 4 (severe damage) scale. Body weight and stool consistencywas recorded at the start and end of the study. Tissue samples werecollected from the distal colon of each mouse and processed, asdescribed previously.

Macroscopic Grading of Colitis

Colons were examined under a dissecting microscope (×5) and graded formacroscopic lesions on a scale from 0 to 10 based on criteria reflectinginflammation, such as hyperemia, thickening of the bowel, and the extentof ulceration.

Quantitative Real-Time PCR

Mouse colon genes expression was evaluated by quantitative real-timepolymerase chain reaction (RT-PCR) like previously described. Total RNAwas isolated from speciments taken from distal colon. Followed primerswere designed using PRIMER3-OUTPUT software, using published sequencedata from the NCBI database:

mGAPDH SEQ ID NOS.: 11 & 12): ctgagtatgtcgtggagtctac andgttggtggtgcaggatgcattg mTNFα(SEQ ID NOS.: 21 & 22): acggcatggatctcaaagacand gtgggtgagcacgtagt mIL1β(SEQ ID NOS.: 23 & 24): tcacagcagcacatcaacaaand tgtcctcatcctcgaaggtc mIL6 (SEQ ID NOS.: 25 & 26):ccggagaggagacttcacag and tccacgatttcccagagaacmINFγ(SEQ ID NOS.: 27 & 28): gctttgcagctcttcctcat andgtcaccatccttttgccagt miNOS (SEQ ID NOS.: 29 & 30): acgagacggataggcagagaand cacatgcaaggaagggaact mTGFβ1 (SEQ ID NOS.: 31 & 32):ttgcttcagctccacagaga and tggttgtagagggcaaggacmFXR (SEQ ID NOS.: 33 & 34): tgtgagggctgcaaaggttt andacatccccatctctctgcac

Example 5 Evaluation of Efficacy of UPF-987 in Rat Cholestatic Model(ANIT)

Background

Cholestasis results in intrahepatic accumulation of cytotoxic bile acidswhich cause liver injury ultimately leading to biliary fibrosis andcirrhosis. Cholestatic liver damage is counteracted by a variety ofintrinsic hepatoprotective mechanisms. Such defense mechanisms includerepression of hepatic bile acid uptake and de novo bile acid synthesis.Furthermore, phase I and II bile acid detoxification is inducedrendering bile acids more hydrophilic. In addition to “orthograde”export via canalicular export systems, these compounds are also excretedvia basolateral “alternative” export systems into the systemiccirculation followed by renal elimination. Passive glomerular filtrationof hydrophilic bile acids, active renal tubular secretion, andrepression of tubular bile acid reabsorption facilitate renal bile acidelimination during cholestasis. The underlying molecular mechanisms aremediated mainly at a transcriptional level via a complex networkinvolving nuclear receptors and other transcription factors. So far, thefarnesoid X receptor FXR, pregnane X receptor PXR, and vitamin Dreceptor VDR have been identified as nuclear receptors for bile acids.However, the intrinsic adaptive response to bile acids cannot fullyprevent liver injury in cholestasis. Therefore, additional therapeuticstrategies such as targeted activation of nuclear receptors are neededto enhance the hepatic defense against toxic bile acids.

Materials and Methods

Animals

Wistar Rats studies were approved by the Animal Study Committee of theUniversity of Perugia. Male Wistar rats (200-250 g) were obtained fromCharles River Breeding Laboratories (Portage, Mich.) and maintained onstandard laboratory rat chow on a 12-h light/dark cycle.

Colestatic Models: Method: Alpha-Naphthyl-Isothiocyanate (ANIT)

The first rats group (N=6) was treated, daily, by ANIT 100 mg/kg viagavage (colestatic inducer), the second and third groups (N=6) weretreated by ANIT 100 mg/kg via gavage plus UPF-987 5 and 3 mg/kgintraperitoneally daily. Control rats (N=4) were administered vehicle(physiologic solution I.P.). At the end of the study, rats weresacrificed under anaesthesia with sodium pentobarbital (50 mg/kg i.p.)and terminally bled via cardiac puncture; the liver was removed andweighted for examination and blood samples were taken.

Quantitative Real-Time PCR

Rat genes expression was evaluated by quantitative real-time polymerasechain reaction (RT-PCR) as previously described herein. The followingPCR primers (SEQ ID NOS.: 35-52) were designed using PRIMER3-OUTPUTsoftware using published sequence data from the NCBI database:

rGAPDH (SEQ ID NOS.: 35 & 36): atgactctacccacggcaag andatgactctacccacggcaag rSHP (SEQ ID NOS.: 37 & 38): cctggagcagccctcgtctcagand aacactgtatgcaaaccgagga rBSEP (SEQ ID NOS.: 39 & 40):aaggcaagaactcgagataccag and tttcactttcaatgtccaccaacrCYP7A1 (SEQ ID NOS.: 41 & 42): ctgcagcgagctttatccac andcctgggttgctaagggactc rCYP8B1 (SEQ ID NOS.: 43 & 44):cccctatctctcagtacacatgg and gaccataaggaggacaaaggtctrNTCP (SEQ ID NOS.: 45 & 46): gcatgatgccactcctcttatac andtacatagtgtggccttttggact rMdr1 (SEQ ID NOS.: 47 & 48):cgttgcctacatccaggttt and gccattgcctgaaagaacatrMdr2 (SEQ ID NOS.: 49 & 50): gttctcgctggtcttcttgg andcgtctgtggcgagtcttgta rMMP2 (SEQ ID NOS.: 51 & 52): gatggatacccgtttgatggand tgaacaggaaggggaacttgResults

UPF-987 was tested in vivo for its ability to protect againstcholestasis induced in rat by α-naphthylisothiocyanate (ANIT). ANITadministration leads to a severe cholestasis, previous studies byFiorucci et al. (unpublished) have shown that 6-ECDCA is not effectivein reducing liver injury in this model. Administration of UPF-987attenuates liver injury in ANIT treated rats, as measured by assessingplasma levels of AST, γGT and alkaline phosphatase, three markers ofcholestasis and plasma cholesterol. In addition UPF-987, modulates NTCP,CYP7A1 and BSEP expression.

Example 6 Evaluation of Efficacy of INT-1103 in Rat Cholestatic Model(ANIT)

Background

INT-1103 is sulphide derivative of 6-ethyl-chenodeoxycholic acid(6E-CDCA or INT-747), which is disclosed and in U.S. Pat. No. 7,138,390and incorporated by reference herein.

Material and Methods

Colestatic Models: Alpha-Naphthyl-Isothiocyanate (ANIT) Wistar Rats

Studies were approved by the Animal Study Committee of the University ofPerugia. Male Wistar rats (200-250 g) were obtained from Charles RiverBreeding Laboratories (Portage, Mich.) and maintained on standardlaboratory rat chow on a 12-h light/dark cycle. The first group (N=8)were treated, daily, by ANIT 100 mg/kg via gavage (colestatic inducer),the second and third groups (N=8) were treated by ANIT 100 mg/kg viagavage plus INT-1103 5 mg/kg intraperitoneally daily. Control rats (N=8)were administered vehicle (physiologic solution I.P.). At the end of thestudy, rats were sacrificed under anaesthesia with sodium pentobarbital(50 mg/kg i.p.) and terminally bled via cardiac puncture; the liver wasweighted and removed for examination and blood samples were taken.

Quantitative Real-Time PCR

The expression of rat FXR target genes was evaluated by quantitativereal-time polymerase chain reaction (RT-PCR) as previously describedherein. The following PCR primers (SEQ ID NOS.: 35-52) were designedusing PRIMER3-OUTPUT software using published sequence data from theNCBI database:

rGAPDH (SEQ ID NOS.: 35 & 36): atgactctacccacggcaag andatgactctacccacggcaag rSHP (SEQ ID NOS.: 37 & 38): cctggagcagccctcgtctcagand aacactgtatgcaaaccgagga rBSEP (SEQ ID NOS.: 39 & 40):aaggcaagaactcgagataccag and tttcactttcaatgtccaccaacrCYP7A1 (SEQ ID NOS.: 41 & 42): ctgcagcgagctttatccac andcctgggttgctaagggactc rCYP8B1 (SEQ ID NOS.: 43 & 44):cccctatctctcagtacacatgg and gaccataaggaggacaaaggtctrNTCP (SEQ ID NOS.: 45 & 46): gcatgatgccactcctcttatac andtacatagtgtggccttttggact rMdr1 (SEQ ID NOS.: 47 & 48):cgttgcctacatccaggttt and gccattgcctgaaagaacatrMdr2 (SEQ ID NOS.: 49 & 50): gttctcgctggtcttcttgg andcgtctgtggcgagtcttgta rMMP2 (SEQ ID NOS.: 51 & 52): gatggatacccgtttgatggand tgaacaggaaggggaacttg

Example 7 Evaluation of Efficacy of INT-1103 in Rat Cholestatic Model(BTL)

Material and Methods

The (BTL) hepatic cholestatic model was induced by bile duct ligation(BDL) of 225-250 g old male Wistar rats. Sham-operated rats (N=8)received the same laparoscopic procedure, except that the bile duct wasmanipulated, but not ligated and sectioned. In total, 24 animals wereoperated. Three days after surgery, surviving rats were randomized toreceive placebo, intraperitoneally, (fisiologic solution) (N=6) orINT-1103 5 mg/kg (N=8). Animals were then treated for 7 days. At the endof the study, rats were sacrificed under anaesthesia with sodiumpentobarbital (50 mg/kg i.p.) and terminally bled via cardiac puncture;the liver was weighted and removed for examination and blood sampleswere taken.

Example 8 Evaluation of Efficacy of INT-1103 and INT-747 in Bile Flow onNaïve Rat

Material and Methods

Adult male Wistar rats weighing 200 to 250 g were used throughout thestudy. Before the experiments, the animals were maintained on standardchow and water ad libitum and housed in a temperature (21-23° C.)- andhumidity (45-50%)-controlled room under a 12-h light/dark cycle. Allstudies were approved by the Animal Study Committee of the University ofPerugia. For bile flow measurement, animals were anesthetized with asingle dose of sodium pentobarbital (50 mg/kg body wt intraperitoneally)and maintained under this condition throughout the experiment. Aftercatheterization of the jugular vein using a PE-50 polyethylene tubing(Intramedic; Clay Adams, Parsippany, N.J.), a middle abdominal incisionwas made, and the common bile duct was also cannulated (PE-10,Intramedic; Clay Adams). Body temperature was maintained at 37.0 to38.5° C. with a warming lamp to prevent hypothermic alterations of bileflow. The bile samples were collected by the external biliary fistulaevery 15 min for 195 min and then weighed in order to determine the bileflow. Bile flow was determined by gravimetry, assuming a density of thebile of 1.0 g/ml. Bile collection started between 9:00 and 11:00 AM tominimize influence of circadian variations. Drugs administration wasdone by jugular cannula at the doses of 3 μmoli/kg/min, control groupreceived vehicle alone (BSA 2% on fisilogic solution).

Example 9 Evaluation of Efficacy of INT-1103 and INT-747 in Bile Flow onEstrogen Colestatic Rat

Material and Methods

Adult male Wistar rats weighing 300 to 350 g were used throughout thestudy. Before the experiments, the animals were maintained on standardchow and water ad libitum and housed in a temperature (21-23° C.)- andhumidity (45-50%)-controlled room under a 12-h light/dark cycle. Allstudies were approved by the Animal Study Committee of the University ofPerugia. Animals were randomly divided into 4 experimental groups:

-   1. Naïve, (N=5).-   2. 17-ethynylestradiol 5 mg/kg for 5 days intra-peritoneal, (N=8).-   3. 17-ethynylestradiol 5 mg/kg+INT-747 5 mg/kg intra-peritoneal, for    5 days (N=7);-   4. 17-ethynylestradiol 5 mg/kg+INT-1103 5 mg/kg intra-peritoneal,    for 5 days (N=7).    -   For bile collection, surgical procedures were made on the sixth        day (1 day after the administration of the last dose of E217).        For bile flow measurement, animals were anesthetized with a        single dose of sodium pentobarbital (50 mg/kg body wt        intraperitoneally) and maintained under this condition        throughout the experiment. A middle abdominal incision was made,        and the common bile duct was also cannulated (PE-10, Intramedic;        Clay Adams). Body temperature was maintained at 37.0 to 38.5° C.        with a warming lamp to prevent hypothermic alterations of bile        flow. Bile collection started between 9:00 and 11:00 AM to        minimize influence of circadian variations. Bile was collected        at 15-min intervals for 120 min, and bile flow was determined        gravimetrically. At the end of the experiments the body and        liver rats was weighted.

Example 10 In Vitro Study of Insulin Gene Regulation by INT-747 VsINT-1103

Material and Methods

For RT-PCR assay, pancreatic Beta-TC6 cells were cultured in D-MEMsupplemented with 1% penicillin/streptomycin, 1% L-glutamine and 10%fetal bovine serum (high glucose) (CELBIO). Cells were grown at 37° C.in 5% CO2 and treated with INT-1103 and INT-747, at the finalconcentration 1 μM, for 18 hours. At the and of the experiments thecells were collected for RNA extraction.

Real Time PCR

Quantification of the expression of mouse genes was performed byquantitative real-time polymerase chain reaction (RT-PCR). All PCRprimers were designed using PRIMER3-OUTPUT software using publishedsequence data from the NCBI database. Total RNA was isolated (TRIzolreagen, Invitrogen srl, Milan, Italy) from speciments taken from livers.One microgram of purified RNA was treated with DNAse I for 10 minutes atroom temperature, followed by incubation at 95° C. for 3 minutes in thepresence of 2.5 mmol/L EDTA. The RNA was reverse transcribed withSuperscript III (Invitrogen, Carsbad, Calif.) in 20 μL reaction volumeusing random primers. For quantitative RT-PCR, 100 ng template wasdissolved in a 25 μL containing 0.3 μmol/L of each primer and 12.5 μL of2×SYBR Green PCR Master mix (Fynnzimes-DyNAmo SYBRR Green qPCR mix). Allreactions were performed in triplicate, and the thermal cyclingconditions were as follows: 2 minutes at 95° C., followed by 50 cyclesof 95° C. for 20 seconds, 55° C. for 20 seconds and 72° C. for 30seconds on iCycler iQ instrument (Bio-Rad, Hercules, Calif.). The meanvalue of the replicates for each sample was calculated and expressed asthe cycle threshold (CT; cycle number at which each PCR reaction reachesa predetermined fluorescent threshold, set within the linear range ofall reactions). The amount of gene expression was then calculated as thedifference (OCT) between the CT value of the sample for the target geneand the mean CT value of that sample for the endogenous control (GAPDH).Relative expression was calculated as the difference (ΔΔCT) between OCTvalues of the test control sample for each target gene. The relativemRNA expression was shown as 2^(−ΔΔCT). The Primers used in Real-TimePCR were:

mGAPDH (SEQ ID NOS.: 53 & 54): gaaggtgaaggtcggagt andcatgggtggaatcatattggaa; Mshp (SEQ ID NOS.: 55 & 56):gctgtctggagtccttctgg and ccaatgatagggcgaaagaagag;mSREBP1c (SEQ ID NOS.: 57 & 58): gcaaggccatcgactacatt andggtcagtgtgtcctccacct. mINS (SEQ ID NOS.: 59 & 60): tgttggtgcacttcctacccand ttgttccacttgtgggtcct mSHP (SEQ ID NOS.: 61 & 62):aagggcttgctggacagtta and tctcttcttcctccctatcamGLUT2 (SEQ ID NOS.: 63 & 64): ccctgggtactcttcaccaa andgccaagtaggatgtgccaat

Example 11 Physico-Chemical Properties of INT-747 and INT-1103

Background

The two bile acid analogues, INT-747 and INT-1103, were admitted to acomplete physico-chemical properties characterization followingprotocols previously developed and optimized in our laboratory andpreviously applied for a complete screening of a large series of Bileacid analogues (UDCA analogues) developed in the R. Pellicciari lab. Thephysico-chemical properties were selected to accurately define thebehaviour in aqueous solutions and in biological fluids and to establishtheir potential toxicity to biological membranes, their pharmacokineticsand pharmacodynamics and biodistribution in the different biologicalfluids and organs. Comparative data with natural analogues will be alsoperformed and discussed.

Water Solubility

Only side chain carboxylated BA INT-747, CDCA and UDCA were studied.Solid BA were suspended in 5 ml of 0.1 M HCl. The saturated solutions,after incubation for 1 week, were filtered on a Millipore filter (0.22μm) and the concentration of BA was measured by HPLC-ESI-MS/MS using C18column (150 mm×2 mm i.d., 4 μm) and mobile phases of water containing 15mM acetic acid pH 5 and acetonitrile. The flow rate was 150 μl/min. Themass spectrometry acquisition was performed in the multiple reactionmonitoring mode using the ESI source in negative ionization. Watersolubility was expressed as μmol/liter

TABLE 3 water solubility of the studied bile acids Bile Acid WaterSolubility (μM)* INT-747 9.0 INT-103 — CDCA 32 UDCA 7.5 *watersolubility refers to BA as protonated species and therefore notevaluated for INT-1103

The water solubility was measured for the insoluble protonated speciesof carboxylated bile acids at a pH 1. The sulphate compound, UPF 1103 isionized even at low pH and in physiological conditions is always solublein all biological fluids. The water solubility of INT-747 is 9 μM, lowerthan CDCA, and comparable with that of UDCA. Since the CMC of INT-747 isrelatively low (see next paragraph), the low water solubility of INT-747do not compromise the behaviour of the compound in a micellar phase; inthe case of UDCA, the low water solubility associated with an high CMCcompromises the pH at which the protonated acid goes in solution to formmicelles. The CMpH is, in fact, for UDCA 8.4, which is too high if isnot present a postprandial alkalinization in duodenal content.

Critical Micellar Concentration (CMC)

This value was determined by surface tension measurements using amaximum bubble-pressure method. The tensiometer was a Sensadyne 6000(Chem-Dyne Research Corp., Milwaukee, Wis.) equipped with two glassprobes of 0.5 and 4.0 mm diameters connected to a source of nitrogen.The bubble frequency was 1 bubble/second in distilled water at 26° C.(P=2.7 atm) and the calibration was made with double-distilled water andmethanol. The surface tension of BA sodium salts solutions both in waterand in NaCl 0.15 M was measured at various concentrations range, 0.2-75mM and 0.3-100 mM respectively. The surface tension values were plottedagainst the logarithm of the bile salt concentration; the regressionlines corresponding to the two parts of the curve (monomeric andmicellar phases) were calculated using the method of least squares, andthe intersection of the lines was taken as the CMC value.

TABLE 4 Critical Micellar Concentration of the studied bile acids CMC(mM) ST_(CMC) ST₅₀ Bile Acid H₂O NaCl 0.15M Dyne/cm Dyne/cm INT-747 4.52.9 48.8 43.2 INT-1103 3.9 1.3 47.9 43.3 CDCA 7.5 3.0 55.6 48.5 UDCA 266.0 63.0 50.4 TUDCA 8.0* 2.2* — — TCDCA 7.0* 3.0* — — ST_(CMC): SurfaceTension at CMC in water, ST₅₀: Surface Tension of 50 mM aqueoussolution; *values from literature

The CMC, as evaluated by surface tension measurements in non equilibriumconditions i.e. in conditions that impurities do not affect the results,of INT-747 and INT-1103 are relatively low, similar to CDCA naturalanalogue. INT-1103 presents the lower CMC both in water and in presenceof counter ion Na+ 150 mM. The low CMC value of INT-747 is related tothe topographic distribution of the ethyl and hydroxyl groups: the ethylgroup in the 6 position is oriented in the β face, the back of thesteroid, contributing to increase the lipophilic extent and area of thesurface of this moiety and therefore the tendency to form micelles.INT-1103 presents the lower CMC as result of ethyl group in 6 positionand the 23 sulphate in the side chain. The peculiar properties of thesulphate group gave to INT-1103 anionic surfactant like properties (likesodium dodecyl sulphate) as a result of a negative charged head andlipophilic tail with a surface lipophilic moiety. The values of thesurface tension activity both at CMC and in micellar phase (50 mM) agreewith the present CMC data, both compounds are surface active and able tolower the surface tension to a great extent in respect to UDCA andTUDCA. This data further supports the concept that this compounds aredetergent like the CDCA analogue and even more. INT-747 at a relativelyhigh concentration >60 mM and in the presence of Na+ 0.15 M form a gelphase and this account for the relatively inaccurate ST data found inthat conditions (FIG. 1) These results are not surprising since otherdetergent natural BA like deoxycholic acid behave similarly forming thisgel (usually viscoelastic) particularly for the effect of counter ionslike Na+ and Ca++ This phase evolves to micellar phase with a relativelylow kinetics. Moreover this phenomenon occurs at a very high notphysiological concentration.

Octanol/Water Partition Coefficient

1-Octanol/water partition coefficient (log P) was evaluated using aconventional shake-flask procedure. The experiments were carried out on0.1 mM bile salt solution buffered at pH 8 with 0.1 M phosphate bufferto ensure complete ionization of the BA; the log P values refer to theBA in the ionized form, not to the protonated species, and the initialconcentration of each BA was below its own CMC value. The aqueous bufferwas previously pre-saturated with 1-octanol, 5 ml of 1-octanolpre-saturated with water was then added and the samples were left toequilibrate for 2 weeks under continuous stirring at room temperatureAfter centrifugation the two phases were carefully separated. BAconcentration in the water phase was measured with HPLC-ESI-MS/MS usingC18 column (150 mm×2 mm i.d., 4 μm) and mobile phases: A: watercontaining 15 mM acetic acid pH 5, B: acetonitrile. The flow rate was150 μl/min and the column was maintained at 45° C. The mass spectrometryacquisition was performed in the multiple reaction monitoring mode usingthe ESI source in negative ionization.

TABLE 5 1-octanol-water partition coefficient of the studied bile acidsas ionized species Bile Acid LogP_(A) ⁻ INT-747 2.5 INT-1103 2.0 CDCA2.2 UDCA 2.2 TCDCA 0.9 TUDCA 1.0* *value from literature

The 1-octanol/water partition coefficient was calculated for the ionizedspecies to facilitate the comparison between the carboxyl and sulphatebile acids since the latter do not protonated even at very low pH.INT-747 presents a slightly higher lipophilicity in respect to otherdihydroxy bile acids such as UDCA and CDCA. The increased lipophilicityis the result of the introduction of an ethyl group in position 6. Thetendency to distribute in a lipid domain is therefore higher. The UPF1103 shows a log P of 2.0, value slightly lower than INT-747 and naturalCDCA and UDCA analogues and this account for the contribution of thesulphate group and side chain length. Moreover the lipophilicity ofINT-1103 is still similar to an unconjugated BA and higher than taurineconjugated like TCDCA that present a log P of 0.9. Contrarily to Taurineconjugate which preferentially stay in a water domain, INT-1103 has atendency to accumulate in a lipid domain like INT-747.

Albumin Binding

Albumin binding was evaluated by equilibrium dialysis at a fixedBA-albumin ratio. BA was dissolved at a concentration of 100 μM in 5%bovine serum albumin-saline solution and left to stand for 24 h at 25°C. Two ml of this solution was dialyzed in cellulose sacs having amolecular weight cut-off of 12-14,000 against 25 ml of saline solution.The system was equilibrated by mechanical shaking for 72 h at 25° C. BAconcentrations of the dialyzed solution and of the starting solutionwere determined with HPLC-ESI-MS/MS in the same conditions of theprevious analysis.

TABLE 6 Albumin binding of the studied bile acids Bile Acid % BindingINT-747 96 INT1103 85 CDCA 93 UDCA 94 TUDCA 67 CA  40* *values fromliterature

Both INT-747 and UPF 1103 present a strong interaction with albuminquite similar to natural dihydroxy bile acid like CDCA and UDCAsuggesting a similar kinetic in the hepatic uptake. Trihydroxy bileacids like cholic acid or taurine conjugated bile acids show a lowerinteraction with albumin and this account to the lower serumconcentration at a similar intestinal uptake as a result of a higherfirst pass clearance. The unbound fraction (like for many drugs)modulates the liver uptake: as the fraction increase the higher is theuptake. INT-747 and INT-1103 present a low unbound fraction andtherefore their serum concentration are higher as a result of arelatively low first pass clearance, and their behaviour is similar tonatural analogs.

Critical Micellar pH

This value can be experimentally determined by evaluating the pH atwhich a given BA starts to precipitate from a micellar solution. It canbe calculated from the CMC Water solubility of the protonated speciesand pKa using the formula: CMpH=pKa+log CMC/WS. The CMpH of the studiedcompounds in comparison with the natural analogs are reported in TableI.

TABLE 7 Critical Micellar pH the studied bile acids Bile Acid CMpH UPF747 7.7 UPF1103 — CDCA 7.6 UDCA 8.4 TCDCA —

The CMpH value of INT747 is similar to that of CDCA and lower to UDCA.According to this value INT747 do not present problems of intestinalsolubility and requires a pH of 7.6 which is physiological to go insolution. For example UDCA with a CMpH of 8.4 requires an higheralkalinization of the duodenal content and only in post-prandial phaseis solubilized in a micellar phase. UP 1103 having a sulphate group donot present these problems since is always soluble in the physiologicalpH from 2 to 9 since the pKa is very low and the compound do notprotonated to form insoluble molecule. Its behaviour is similar totaurine conjugated bile acids.

Example 12 Hepatic Metabolism and Secretion of INT-747 and INT-1103 inRat after One Hour iv Infusion at a Dose of 3 umol/Kg/Min

Background

The BA were administered by infusion to bile fistula rat and bilecollected at 15 min intervals for 7 hours. The bile flow was measuredand bile analyzed using HPLC-ES-MS-MS for the identification of the rateof biliary secretion and to evaluate the major hepatic metabolites.

HPLC-ES-MS/MS Method

Bile acids and their metabolites were determined by a liquidchromatography-tandem mass spectrometry (HPLC-MS/MS) method usingelectrospray (ESI) source in negative ionization mode. Rat bile sampleswere brought to room temperature and diluted 1:100 v/v-1:1000 v/v with15 mM ammonium acetate buffer (pH=5). Then, 10 μL were injected into thechromatographic column. Liquid chromatography was performed using aWaters Alliance 2695 separation module coupled with autosampler. Bileacids were analyzed using a Synergi Hydro-RP C18 column (150×2.0 mmi.d., 4 μm particle size), protected by a SecurityGuard ODS 4×2.0 mmi.d. precolumn, both supplied from Phenomenex. Bile acids were separatedin elution gradient using 15 mM ammonium acetate buffer (pH=5.00) asmobile phase A and acetonitrile as mobile phase B. Mobile phase B wasincreased from 30% to 64% in 12 min, then to 70% in 8 min, and finallybrought to 100% in 10 min and held constant for 1 min. Flow rate was 150μL/min and the column was maintained at 45° C. The column effluent wasanalysed by ESI-MS/MS using a Quattro-LC (Micromass) triple quadruplemass spectrometer operating in Multiple Reaction Monitoring (MRM)acquisition mode. MassLynx software version 4.0 was used for dataacquisition and processing.

Results

INT-747 is secreted into bile mainly as taurine conjugate and itsrecovery is almost complete: at the administered dose more than 99% ofthe infused molecule is secreted into bile as shown in FIG. 3. At thelast point of bile collection a relatively high amount of the taurineconj. compound is still secreted in bile. The maximum secretion rate isachieved after 120 minutes just at the end of the infusion. A steadystate concentration is maintained for additional 30 minutes. The taurineconjugation process begin very early and appears efficient at theadministered dose. Trace amount of the compound is also conjugate withglycine, less than 0.2% and similar amount is secreted as such in bile.The behaviour of INT-747 is similar to that of natural dihydroxy analogssuch as CDCA or UDCA which are secreted into bile only as taurine andglycine conjugates. Differently, trihydroxy BA such as CA, can be alsopartially secreted in unconjugated form. The extent of a BA that can besecreted unmodified is related to its lipophilicity and is dose andspecies dependent.

The behaviour in term of hepatic uptake and secretion of this moleculeis quite similar to natural analogue like CDCA and the rate of hepaticsecretion is related to that of taurine conjugation mediated by a CoAactivation and taurine liver availability. The preferential conjugationwith taurine is peculiar to rat and other species (dog, mice, . . . )and in man this compound is amidated mainly with glycine. According tothese date seems that INT-747 is efficiently take up and secreted by theliver. The hepatic metabolism of INT-747 produces mainly the taurineconjugate form. Trace amount of glycine conjugate are secreted in bileand also very low amount is secreted as such. (FIGS. 37 and 38). Minorepimers of both unconjugated and taurine conjugated are present in bile(FIGS. 39 and 40).

INT-1103 is secreted in bile partially unmodified as reported in FIG.41. The amount of INT-1103 secreted in bile is approx. 30-40% of theadministered dose and its secretion rate is relatively low and at theend of the collection period a relatively high amount of the molecule isstill secreted into bile. The main hepatic metabolite of INT-1103 in ratat the administered dose is the 3-glucoronide as reported in FIG. 42.The amount of this compound has not be quantified since the purereference standard is not available. Other metabolites are secreted intobile as reported in FIG. 43 and in more details in FIG. 43 and FIG. 44.The main identified metabolites is the 3-sulphate conjugate, an hydroxyanalog (one more hydroxyl), keto derivatives and epimers of INT-1103.The exact amount of these compound were not quantified since thestandards are not yet available.

These data suggest that INT-1103 can be secreted in bile as such and itsbehaviour is different from natural dihydroxy analogs such as CDCA andINT-747 that require a conjugation with taurine and glycine to besecreted into bile. This is a main requisite for molecules with thislipophilicity. On the contrary trihydrohy BA such as CA or UCA can besecreted in bile also partially as such. The sulphate group present inINT1103 facilitate the secretion process even if the molecule is stillquite lipophilic and the behaviour is between an unconjugated andtaurine conjugated bile acid. Moreover the liver strong metabolize thiscompound forming more hydrophilic compound such as 3-glucuronides,3-sulphates and hydroxylated analogs. The extensive metabolism do toretained compound is related to the animal species and to theadministered dose and according to these data we can speculate that thiscompound present a metabolism more similar to an “acids steroids”slightly different from a common bile acid, but maybe sharing sameproperties. We do not know the metabolism in human but if its behaviouris more like a steroid is may be underwent to 3-glucuronidation even inhumans. The compound was administered iv and addition data are requiredto evaluate the extent of its intestinal absorption ie passive or activelike a taurine conjugate.

Example 13 In Vitro Metabolic Stability in Human Stools Culture

Stability to Intestinal Bacteria; 7α-Dehydroxylation

Homogenized fresh human stools (500 mg) were transferred into sterilevials to which 5 mL of sterilized chopped meat-glucose medium (ScottLab., Fiskville, R.I.) was added. BA were then added at a finalconcentration of 0.05 mM. Vials were incubated at 37 C; then, at 0, 4,8, 16, 20, 24, and 72 h after the addition of the BA, the reaction wasstopped with 150 L of 30% KOH. The samples were centrifuged at 3500 rpmfor 10 min; from the supernatant the BA were isolated by C-18solid-phase extraction and analyzed by TLC and HPLC-ES-MS/MS. Thin-layerchromatography (TLC), utilizing silica gel 0.25 m thickness plates(Merck, Darmstat, Germany), was employed as the first screening test.The solvent system used for the separation of conjugated BA was composedof propionic acid/isoamyl acetate/water/N-propanol (3:4:1:2, v/v/v/v;solvent I), and that of the unconjugated BA was acetic acid/carbontetrachloride/isopropyl ether/isoamyl acetate/water/N-propanol/benzene(1:4:6:8:2:2, v/v/v/v/v/v; solvent II). Separated BA were revealed with5% phosphomolybdic acid ethanol solution. Both INT-747 and INT-1103 arevery stable when incubated in human stool cultures and even after 24hour more than 85% of the compounds can be recovered unmodified asreported in FIG. 45. On the contrary the reference natural analogue CDCApresent an half-life time of almost one hour and after 8 hours ofincubation is almost completely metabolized (7-dehydroxylated) to formlithocholic acid.

Results

These data, shown in FIG. 46, suggest that the presence of the ethylgroup in the 6 position protect the 7 hydroxyl group toward oxidation orremoval by steric hindrance. In addition both analogues are very stableand particularly INT-1103. The side chain ester bond is quite stable inthe human stool culture. No minor metabolites have been found byHPLC-ES-MS/MS

Example 14 In Vitro Metabolic Stability in Simulated Duodenal/PancreaticFluid (USP Specification)

Material and Methods

This study has been performed only for INT1103 since it contain an esterbond in the side chain and the aim was to verify the stability inpresence of esterase enzymes like present in duodenal and pancreaticjuice. Simulated pancreatic fluid was prepared by dissolving 10 g/LPancreatin (Sigma P8096: pancreatin from porcine pancreas, activity1×USP specifications) in 0.05M phosphate buffer, pH=7.2±0.1. Then, 4-mLaliquots of the simulated pancreatic fluid were added of 50 μM INT-1103and incubated for different times (0, 30, 60, 90, 120, 180 and 240 min)at 37° C. After incubation, a 2-mL aliquot of each solution was addedwith 2 mL of 0.1M NaOH and subjected to bile acids extraction by SPE andanalysis by thin-layer chromatography and mass spectrometry as describedabove.

The invention claimed is:
 1. A compound selected from


2. A method for treating an FXR-mediated disease or condition in amammal, comprising administering to the mammal a therapeuticallyeffective amount of a compound of claim 1, wherein the FXR-mediateddisease or condition is selected from: cholestasis; colitis; a chronicliver disease selected from primary biliary cirrhosis, primarysclerosing cholangitis, nonalcoholic fatty liver disease, andnonalcoholic steatohepatitis, a gastrointestinal disease selected frominflammatory bowel disease, irritable bowel syndrome, bacterialovergrowth, and malabsorption; a renal disease selected from diabeticnephropathy, focal segmental glomerulosclerosis, and chronicglomerulonephritis; a cardiovascular disease selected fromatherosclerosis, arteriosclerosis, dyslipidemia, hypercholesterolemia,and hypertriglyceridemia; and a metabolic disease selected from insulinresistance, Type I and Type II diabetes, and obesity.
 3. The method ofclaim 2, wherein the FXR-mediated disease or condition is cholestasis.4. The method of claim 2, wherein the FXR-mediated disease or conditionis a chronic liver disease.
 5. The method of claim 2, wherein theFXR-mediated disease or condition is a gastrointestinal disease.
 6. Themethod of claim 2, wherein the FXR-mediated disease or condition is arenal disease.
 7. The method of claim 2, wherein the FXR-mediateddisease or condition is a cardiovascular disease.
 8. The method of claim2, wherein the FXR-mediated disease or condition is a metabolic disease.9. A pharmaceutical composition comprising the compound of claim 1 and apharmaceutically acceptable carrier or diluent.